I can't speak for the pa3x or 2x but the answer is yes to each question for the korgpa1x so I assume that's the same for the later series.
Thanks for answering this..
So it seems they are basically the same with the same possibilities, asuming you can use guitar mode in those pads on the korg...
I love the pads on my Tyros 5 and if there where more then 4 pads, it would realy add some fresh possibilities as a standalone acomp mode...
Strange the bith Roland and Ketron never added midipads... And sticked to audio